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Mass spectral studies of naphthoflavones

✍ Scribed by F. H. Guidugli; J. Kavka; M. E. Garibay; R. L. Santillan; P. Joseph-Nathan

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 531 KB
Volume: 22
Category: Article
ISSN: 1076-5174
DOI: 10.1002/oms.1210220802

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✦ Synopsis

The electron impact induced fragmentations of the five possible naphthoflavones have been studied with the aid of low-and high-resolution measurements, metastable decompositions and isotope labelling using either deuterium or carbon-13 atoms. All compounds show both the direct expulsion of a CO residue from the carbonyl group and the retro Diels-Alder cleavage. The abundant [M -HI+ ion has been formulated as the substituted P-tropolone species, which, in the case of P-naphthoflavone, is in competition with a pentacyclic species arising from the elimination of H-5 as evidenced in the spectrum of 5-d-P-naphthoflavone. Other previously unsuspected ions are also in evidence.

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